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316

Jan 17, 2014
01/14

by
Zhou Wang

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a quick excel tool for the conversion between 2 theta and d spacing

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16

Sep 19, 2013
09/13

by
Zhou Wang; Jianlong Chen

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A ring $R$ is said to be $n$-clean if every element can be written as a sum of an idempotent and $n$ units. The class of these rings contains clean ring and $n$-good rings in which each element is a sum of $n$ units. In this paper, we show that for any ring $R$, the endomorphism ring of a free $R$-module of rank at least 2 is 2-clean and that the ring $B(R)$ of all $\omega\times \omega$ row and column-finite matrices over any ring $R$ is 2-clean. Finally, the group ring $RC_{n}$ is considered...

Source: http://arxiv.org/abs/math/0610918v1

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26

Sep 21, 2013
09/13

by
Jiheng Wang; Guangzhe Fan; Zhou Wang

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We propose a simple kernel based nearest neighbor approach for handwritten digit classification. The "distance" here is actually a kernel defining the similarity between two images. We carefully study the effects of different number of neighbors and weight schemes and report the results. With only a few nearest neighbors (or most similar images) to vote, the test set error rate on MNIST database could reach about 1.5%-2.0%, which is very close to many advanced models.

Source: http://arxiv.org/abs/1008.3951v3

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165

Jul 20, 2013
07/13

by
Mohammad Rostami; Oleg Michailovich; Zhou Wang

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Reconstruction of multidimensional signals from the samples of their partial derivatives is known to be a standard problem in inverse theory. Such and similar problems routinely arise in numerous areas of applied sciences, including optical imaging, laser interferometry, computer vision, remote sensing and control. Though being ill-posed in nature, the above problem can be solved in a unique and stable manner, provided proper regularization and relevant boundary conditions. In this paper,...

Source: http://arxiv.org/abs/1107.5790v1

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22

Oct 23, 2014
10/14

by
Yin, Huabin; Zhang, Dan; Wu, Zhipeng; Zhou, Wang; Xiao, Jianru

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This article is from World Journal of Surgical Oncology, volume 12.AbstractStudy design: This was a retrospective study. Objective: The aim of this study was to analyze the clinical characteristics and discuss the treatment options for epidermoid cysts in the lumbar spine. Summary of background data: Epidermoid cysts are rare benign neoplasms, which account for less than 1% of all intraspinal tumors. Due to their rarity, there are only a few case reports in the literature. Complete excision is...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3975861

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27

Sep 23, 2013
09/13

by
Wei Xie; Wei-Hua Lei; Yuan-Chuan Zou; Ding-Xiong Wang; Qingwen Wu; Jiu-Zhou Wang

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We propose a two-component jet model consistent with the observations of several gamma ray bursts (GRBs) and active galactic nuclei (AGNs). The jet consists of inner and outer components, and they are supposed to be driven by the Blandford-Znajek (BZ) and Blandford-Payne (BP) processes, respectively. The baryons in the BP jet is accelerated centrifugally via the magnetic field anchored in the accretion disk. The BZ jet is assumed to be entrained a fraction of accreting matter leaving the inner...

Source: http://arxiv.org/abs/1202.5024v2

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9.0

Jul 20, 2013
07/13

by
Zhi-Yun Wang; Chang-Yin Huang; Ding-Xiong Wang; Jiu-Zhou Wang

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A model of low-frequency quasi-periodic oscillations (LFQPOs) of black hole X-ray binaries (BHXBs) is proposed based on the perturbed magnetohydrodynamic (MHD) equations of accretion disk. It turns out that the LFQPOs frequencies of some BHXBs can be fitted by the frequencies of the toroidal Alfv\'en wave oscillation corresponding to the maximal radiation flux. In addition, the positive correlation of the LFQPO frequencies with the radiation flux from accretion disk is well interpreted.

Source: http://arxiv.org/abs/1203.0080v1

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11

Sep 23, 2013
09/13

by
Hai-Dong Lei; Jin-Zhou Wang; Jing Lv; Yuan-Chuan Zou

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The shallow decay phase of the early X-ray afterglow in gamma-ray bursts discovered by {\it Swift} is a widely discussed topic. As the spectral index does not change at the transferring of the shallow decay phase to a normal phase, it implies this transferring should be a dynamical change rather than a spectral evolution. We suggest both the shallow decay phase and the normal phase are from the external shock in a wind environment, while the transferring time is the deceleration time. We apply...

Source: http://arxiv.org/abs/1109.5218v1

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25

Sep 17, 2013
09/13

by
Chang-Yin Huang; Zhao-Ming Gan; Jiu-Zhou Wang; Ding-Xiong Wang

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We apply epicyclic resonances to the magnetic connection (MC) of a black hole (BH) with a relativistic accretion disc, interpreting the high frequency quasi-periodic oscillations (HFQPOs) with 3:2 pairs observed in three BH X-ray binaries. It turns out that the 3:2 HFQPO pairs are associated with the steep power-law states, and the severe damping can be overcome by transferring energy and angular momentum from a spinning BH to the inner disc in the MC process.

Source: http://arxiv.org/abs/0912.4776v1

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8.0

Sep 21, 2013
09/13

by
Chang-Yin Huang; Ding-Xiong Wang; Jiu-Zhou Wang; Zhi-Yun Wang

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The quasi-periodic oscillations (QPOs) in black hole (BH) systems of different scales are interpreted based on the magnetic reconnection of the large-scale magnetic fields generated by the toroidal electric currents flowing in the inner region of accretion disk, where the current density is assumed to be proportional to the mass density of the accreting plasma. The magnetic connection (MC) is taken into account in resolving the dynamic equations of the accretion disk, in which the MC between...

Source: http://arxiv.org/abs/1301.0162v1

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22

Oct 21, 2014
10/14

by
Zhou, Wang Huai; Zhang, Chuan Guo; Li, Yong Gang; Zeng, Zhi

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This article is from Scientific Reports, volume 4.AbstractThe formation and motion features of self interstitial atom (SIA) clusters in tungsten are studied by molecular dynamics (MD) simulations. The static calculations show that the SIA clusters are stable with binding energy over 2 eV. The SIA clusters exhibit a fast one dimensional (1D) motion along 〈111〉. Through analysis of the change of relative distance between SIAs, we find that SIAs jump in small displacements we call creeping...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4035581